List questions from combinatorial-proofs

Published on 25 Mar 2026 - 7:50

39

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How to show that $p^{2 \times}(n)=p^{3k\pm1}(n)$, $n \in \mathbb{N}$ partitions

Published on 04 Mar 2018 - 17:57

89

Views

Changing coins in change-making problem

Published on 25 Mar 2026 - 11:08

45

Views

How to prove domination in baseball?

Published on 21 Mar 2026 - 22:37

197

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How to prove combinatorial summations?

Published on 22 Mar 2026 - 1:59

219

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Combinatorial proof for a Stirling identity

Published on 25 Mar 2026 - 7:41

260

Views

Prove by a combinatorial argument that ${n \choose r}{r \choose s}={n \choose s} {n-s \choose r-s} $

Published on 25 Mar 2026 - 11:34

214

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Prove by a combinatorial argument that $(n-r){n \choose r}=n{n-1 \choose r}$

Published on 13 Mar 2018 - 14:34

281

Views

Combinatorial proof for the identity $\frac{1}{(1-x)^n}=1+\binom{1+n-1}{1}x+\binom{2+n-1}{2}x^2+\cdots+\binom{r+n-1}{r}x^r+\cdots$

Published on 13 Mar 2018 - 17:13

99

Views

Counting the number of minimal connected supergraphs of an arbitrary disconnected digraph

Published on 25 Mar 2026 - 8:01

209

Views

Two Player Strategy Game

Published on 21 Mar 2026 - 23:45

895

Views

Minimum cut on a directed graph with negative term

Published on 22 Mar 2026 - 22:42

580

Views

Combinatorial proof for Stirling number of 1st kind's generating function

Published on 22 Mar 2018 - 23:47

588

Views

Minimum capacity cut reduction from digraph with two edge weight sets

Published on 23 Mar 2026 - 1:02

235

Views

Combinatorial proof of this question?

Published on 22 Mar 2026 - 6:40

List Question

Combinatorial Proofs for Summations: A Possible Generalisation?

How to show that $p^{2 \times}(n)=p^{3k\pm1}(n)$, $n \in \mathbb{N}$ partitions

Changing coins in change-making problem

How to prove domination in baseball?

How to prove combinatorial summations?

Combinatorial proof for a Stirling identity

Prove by a combinatorial argument that ${n \choose r}{r \choose s}={n \choose s} {n-s \choose r-s} $

Prove by a combinatorial argument that $(n-r){n \choose r}=n{n-1 \choose r}$

Combinatorial proof for the identity $\frac{1}{(1-x)^n}=1+\binom{1+n-1}{1}x+\binom{2+n-1}{2}x^2+\cdots+\binom{r+n-1}{r}x^r+\cdots$

Counting the number of minimal connected supergraphs of an arbitrary disconnected digraph

Two Player Strategy Game

Minimum cut on a directed graph with negative term

Combinatorial proof for Stirling number of 1st kind's generating function

Minimum capacity cut reduction from digraph with two edge weight sets

Combinatorial proof of this question?

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